Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 418:
1859, Beaver, two imperforate proofs of 5c in vermilion or in brown red, the last one with diagonal overprint SPECIMEN in carmine, printed on India paper, no gum as produced, VF, Unitrade #15P, TCiii, C.v. CAD$750, Est. $150-$200, Scott #15
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